Patents by Inventor Sigbert Widmann

Sigbert Widmann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5080790
    Abstract: The instant invention provides a strip shaped filter material having a longitudinal plane with crimps molded therein for filtering a liquid or a gas comprising filter material being folded in a zigzag shape and having individual fold segments; said individual fold segments being held at a distance from one another via the crimps; said filter material having nondeformed filter strip segments adjacent to each crimp; said crimp having a zenith height; and the filter material having a thickness, in a cross section placed perpendicular to the longitudinal plane of the strip, which constantly decreases within the area of the crimps, starting from the nondeformed filter strip segments, up to the zenith height of the crimp, and that at the same time, the filter material is increasingly compressed in the direction of decreasing thickness.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: January 14, 1992
    Assignee: Knecht Filterwerke GmbH
    Inventor: Sigbert Widmann